用循环列表求解n=8 k=4的约瑟夫环问题
问题描述:
答
#include <iostream>
using namespace std;
//1.定义小朋友节点类
class Child
{
public:
int childNo; //当前小孩的编号
Child* leftchild; //记录小孩对象的左邻居
Child* rightchild; //记录小孩对象的右邻居
public:
//构造函数
Child(int num = 0)
{
childNo = num;
leftchild = NULL;
rightchild = NULL;
}
};
//2.定义圆圈游戏类
class Circle
{
public:
int scale; //当前正在参与游戏的人数
Child children[1000];
public:
// 构造函数:初始化每个小孩对象节点的编号
Circle(int num = 1000)
{
scale = num;
for (int i = 0; i < num; i++)
{
children[i] = Child(i);
}
};
//构建节点的循环链表函数:确立每个小孩的左右邻居
void Build()
{
for (int i = 0; i < scale; i++)
{
if (i == 0)
{
children[i].rightchild = &children[1];
children[i].leftchild = &children[scale - 1];
}
else if (i == (scale - 1))
{
children[i].rightchild = &children[0];
children[i].leftchild = &children[scale - 2];
}
else
{
children[i].rightchild = &children[i + 1];
children[i].leftchild = &children[i - 1];
}
}
}
//游戏运行函数:从当前节点顺时针循环开始数num个数
void Run(int T)
{
int count = 1;
Child* current = &children[0];
while (scale > 1)
{
//quit the circle
if (count == T)
{
// 当前数到T的小孩退出游戏,参与游戏人数减少1个
scale = scale - 1;
//把当前的这个小孩的左右邻居用链表连接起来
current->leftchild->rightchild = current->rightchild;
current->rightchild->leftchild = current->leftchild;
current = current->rightchild;
count = 1;
}
else //count the next
{
count = count + 1;
current = current->rightchild;
}
}
cout << "The last child id is " << current->childNo << endl;
}
};
int main()
{
Circle nodes(5); // 圆圈类内有100个节点对象(小孩)
nodes.Build();
nodes.Run(3); // 开始循环运行数“7”的游戏,输出最后的获胜者
system("pause");
return 0;
}
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